/**
 * BibSonomy-Webapp - The web application for BibSonomy.
 *
 * Copyright (C) 2006 - 2016 Knowledge & Data Engineering Group,
 *                               University of Kassel, Germany
 *                               http://www.kde.cs.uni-kassel.de/
 *                           Data Mining and Information Retrieval Group,
 *                               University of Würzburg, Germany
 *                               http://www.is.informatik.uni-wuerzburg.de/en/dmir/
 *                           L3S Research Center,
 *                               Leibniz University Hannover, Germany
 *                               http://www.l3s.de/
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.bibsonomy.webapp.util.spring.security.authentication;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.bibsonomy.util.UrlUtils;
import org.bibsonomy.webapp.util.spring.security.exceptions.AccessDeniedNoticeException;
import org.springframework.security.core.AuthenticationException;

/**
 * @author dzo
 */
public class LoginUrlAuthenticationEntryPoint extends org.springframework.security.web.authentication.LoginUrlAuthenticationEntryPoint {

	private static final String NOTICE_PARAM_NAME = "notice";

	@Override
	protected String determineUrlToUseForThisRequest(final HttpServletRequest request, final HttpServletResponse response, final AuthenticationException exception) {
		final String urlToUse = super.determineUrlToUseForThisRequest(request, response, exception);
		
		/*
		 * if the cause of the exception is an AccessDeniedNoticeException
		 * append the notice param of the exception to the url
		 */
		if (exception.getCause() instanceof AccessDeniedNoticeException) {
			final AccessDeniedNoticeException noticeException = (AccessDeniedNoticeException) exception.getCause();
			return UrlUtils.setParam(urlToUse, NOTICE_PARAM_NAME, noticeException.getNotice());
		}
		
		return urlToUse;
	}
}
